diff --git a/src/txmempool.h b/src/txmempool.h
--- a/src/txmempool.h
+++ b/src/txmempool.h
@@ -133,7 +133,7 @@
                                int64_t modifyCount, int64_t modifySigOpCount);
     // Adjusts the ancestor state
     void UpdateAncestorState(int64_t modifySize, Amount modifyFee,
-                             int64_t modifyCount, int modifySigOps);
+                             int64_t modifyCount, int64_t modifySigOps);
     // Updates the fee delta used for mining priority score, and the
     // modified fees with descendants.
     void UpdateFeeDelta(Amount feeDelta);
diff --git a/src/txmempool.cpp b/src/txmempool.cpp
--- a/src/txmempool.cpp
+++ b/src/txmempool.cpp
@@ -377,7 +377,7 @@
 
 void CTxMemPoolEntry::UpdateAncestorState(int64_t modifySize, Amount modifyFee,
                                           int64_t modifyCount,
-                                          int modifySigOps) {
+                                          int64_t modifySigOps) {
     nSizeWithAncestors += modifySize;
     assert(int64_t(nSizeWithAncestors) > 0);
     nModFeesWithAncestors += modifyFee;